William Abel, a mail censor at Iowa's State Prison, Fort Madison, using a hot iron to bring out a secret message written in lemon juice on a letter.Three Lions/Getty Images Humans have had a long ...

The US Secret Service may temporarily disable text messaging on employee cell phones, two sources familiar with the matter tell CNN, as the agency scrambles to respond to concerns it may have erased ...

The old practice of hiding words or symbols, or engraving letters too small to be read, has come into favor again. By Victoria Gomelsky In 2014, Fie Isolde’s future husband wrote her a 28th birthday ...

Do you ever feel like someone is peering over your shoulder while sending private messages to your friends and family? Well, you won't have to worry about those nosy people knowing what you're sending ...

A Hillhouse student’s eyes widened as he applied grape juice and heat to what appeared to be a blank piece of paper — but instead held a secret message in invisible ink, written as part of a course ...

The House committee investigating the Jan. 6, 2021, riot at the Capitol on Thursday publicized freshly obtained communications from the Secret Service showing agents were aware of concerns about ...

While sending messages via Facebook Messenger may seem like a private way of communicating, it’s not. Facebook does not encrypt your regular messages on Messenger, and they can be handed over as ...

Engineering requires deep attention to detail, but sometimes engineers take it a step further by adding secret, playful ...

Missing Kentucky teen found after two month search, man arrested 'Declaration of vengeance': US strikes dozens of ISIS targets Massive blaze engulfs historic New England wharf as firefighters race to ...